Rock climbing is an exciting activity, even more as a geologist. One day you went out to practice your climbing skills, and once you reached the destination you couldn't help yourself but to describe the pristine igneous rock you were looking at. You first noticed the white colored rock with centimeter scale K-feldspar within a phaneritic arrange of quartz and plagioclase. Upon close inspection, you've also noticed platy muscovite crystals. Which conclusions can you make from the observations above? This rock crystallized below the surface at a temperature lower than 1000 C This rock is a type S granite crystallized due to the effusive flow of a basaltic melt This is an intrusive rock formed a very long time ago, probably in the Archean This is an intrusive rock of intermediate composition

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